Biology: Saving the Cave Paintings

For more than 16,000 years, the prehistoric
paintings in France's famed Lascaux Cave survived in splendid
isolation. Then, after the discovery of the cave by four French schoolboys in 1940,
man returned to the scene. He brought with him a mysterious blight that
threatened to obliterate in a few short years the magnificent red
cows, free-floating horses and other majestic creatures drawn so long
ago on the cavern walls by talented Cro-Magnon artists. Now the
archaeological crisis has apparently passed. French scientists have
successfully diagnosed the illness of the ancient art gallery...